<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>文件上传</title>
    <style type="text/css">
        *{
            margin: 0;
            padding: 0;
            border: 0;
        }
        html,body{
            background: transparent;
            overflow: hidden;
        }
    </style>
</head>
<body>
<form action="" enctype="multipart/form-data" method="post">
    <input type="file" name="upload" id="upload" style="width:100%;height:200px;">
</form>
</body>
</html>